Alexander Fufaev
My name is Alexander FufaeV and here I will explain the following topic:

RMS Values of Voltage and Current. Why?

Explanation

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Using the RMS (»Root Mean Square«) values for sinusoidal voltage \( U_{\text{rms}} ~=~ \frac{U_0}{\sqrt{2}} \) and current \( I_{\text{rms}} ~=~ \frac{I_0}{\sqrt{2}} \), the formula for electric power can be written in the following form:

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The equation has the same form as the electric power for DC current and DC voltage:

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